The Tektronix 7B81P is a programmable time base plug-in for 7000-series scopes that was probably designed in 1975.
It is composed of a digital board, a trigger board, and a sweep board. On the digital board, there is a Motorola 6800 microprocessor and six 6820 Peripheral Interface Adapter ICs to provide more I/O pins. On the trigger board, there is a 155-0126-00, a 155-0109-00, two AD7511 analog switch ICs, an MC1408 DAC, a CD4053 analog switch, and a couple of opamps.
The sweep board is mostly discrete and makes use of Tek-made timebase capacitors.
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Custom ICs used in the 7B81P
|Page||Class||Manufacturer||Model||Part nos||Description||Designers||Used in|
|155-0109-00||Monolithic integrated circuit||Tektronix||M120B||155-0109-00||trigger||Gary Vance||5B25N • 5B31 • 5B40 • 5B42 • 5B44 • 7B50A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P • 7S14 • 5S14N • SC502 • SC504|
|155-0126-00||Monolithic integrated circuit||Tektronix||M121||155-0126-00||trigger source selector and P-P auto amplifier||Art Metz||7B50A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P|